# US 10,122,015 B2 · Positive electrode for lithium secondary battery and lithium secondary battery comprising the same

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- Number: US 10,122,015 B2
- Document ID: US10122015B2
- Status: Granted
- Kind: B2
- Application number: 13/370,218
- Filed: 2012-02-09
- Published: 2012-09-27
- Granted: 2018-11-06
- Earliest claimed: 2011-03-22
- Assignees: Samsung SDI Co., Ltd.
- Applicants: Seung-Hun Han; Jun-Kyu Cha; Hye-Sun Jeong; Kwi-Seok Choi
- Inventors: Seung-Hun Han; Jun-Kyu Cha; Hye-Sun Jeong; Kwi-Seok Choi
- Web page: https://patentgrep.com/patent/US10122015B2

## CPC

- H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/364: {as mixtures}
- H01M 4/587: for inserting or intercalating light metals
- H01M 4/622: {being polymers}
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A positive electrode for a lithium secondary battery is described which includes a lithium transition metal complex oxide including a lithium nickel based complex oxide and/or a lithium cobalt based complex oxide, active carbon having a specific surface area of from about 900 m2/g to about 1600 m2/g, and a water-based binder.

## Claims

### Claim 1

A positive electrode for a lithium battery comprising:
LiNi1-x-yCoxMnyO2,
wherein 0<x<0.5, 0<y<0.5;
active carbon having a specific surface area of from about 1250 m2/g to about 1450 m2/g;
a water-based binder comprising acrylic resin based binder and
a conducting agent,
wherein a content ratio of the active carbon to the conducting agent is from about 1.6:1 to about 1:1.6.

### Claim 2 (depends on 1)

The positive electrode of claim 1, wherein the active carbon is in an amount from about 1 to about 10 parts by weight based on 100 parts by weight of the lithium transition metal complex oxide.

### Claim 3 (depends on 1)

The positive electrode of claim 1, wherein the active carbon is in an amount from about 1 to about 5 parts by weight based on 100 parts by weight of the lithium transition metal complex oxide.

### Claim 4 (depends on 1)

The positive electrode of claim 1, wherein the active carbon has an average diameter of from about 0.03 to about 20 μm.

### Claim 5 (depends on 1)

The positive electrode of claim 1, wherein the active carbon has an average diameter of from about 5 to about 15 μm.

### Claim 6 (depends on 1)

The positive electrode of claim 1, wherein the active carbon has an average diameter of about 10 μm.

### Claim 7 (depends on 1)

The positive electrode of claim 1, wherein the lithium transition metal complex oxide has a pH of from about 11 to about 13.

### Claim 8 (depends on 1)

The positive electrode of claim 1, wherein the water-based binder comprises acrylate copolymer emulsion.

### Claim 9 (depends on 1)

The positive electrode of claim 1, wherein the conducting agent is in an amount of from about 1 to about 5 parts by weight based on 100 parts by weight of the lithium transition metal complex oxide.

### Claim 10 (depends on 9)

The positive electrode of claim 9, wherein the conducting agent is at least one selected from the group consisting of graphite, natural graphite, synthetic graphite, carbon black, acetylene black, Denka Black, Ketjen black, channel black, furnace black, lamp black, conductive fiber, carbon fiber, metal fiber; metal powder, fluorocarbon powder, aluminum powder, nickel powder, a conductive whisker, zinc oxide, potassium titanate, a conductive metal oxide, titanium oxide and a polyphenylene derivative.

### Claim 11

A lithium secondary battery comprising:
a positive electrode,
a negative electrode,
and a separator,
wherein the positive electrode comprises:
active carbon having a specific surface area of from about 1250 m2/g to about 1450 m2/g;
a water-based binder comprising acrylic resin based binder;
LiNi1-x-yCoxMnyO2,
wherein 0<x<0.5, 0<y<0.5; and
a conducting agent,
wherein a content ratio of the active carbon to the conducting agent is from about 1.6:1 to about 1:1.6.

### Claim 12 (depends on 11)

The lithium secondary battery of claim 11, wherein the active carbon is from about 1 to about 10 parts by weight based on 100 parts by weight of the lithium transition metal complex oxide.

### Claim 13 (depends on 11)

The lithium secondary battery of claim 11, wherein the active carbon has an average diameter of from about 0.03 to about 20 μm.

### Claim 14 (depends on 11)

The lithium secondary battery of claim 11, wherein the water-based binder comprises acrylate copolymer emulsion.

### Claim 15 (depends on 11)

The lithium secondary battery of claim 11, wherein the conducting agent is in an amount of from about 1 to about 5 parts by weight based on 100 parts by weight of the lithium transition metal complex oxide.

### Claim 16 (depends on 15)

The lithium secondary battery of claim 15, wherein the conducting agent is at least one selected from the group consisting of graphite, natural graphite, synthetic graphite, carbon black, acetylene black, Denka Black, Ketjen black, channel black, furnace black, lamp black, conductive fiber, carbon fiber, metal fiber; metal powder, fluorocarbon powder, aluminum powder, nickel powder, a conductive whisker, zinc oxide, potassium titanate, a conductive metal oxide, titanium oxide and a polyphenylene derivative.